5 ideas
20947 | Thoughts are learnt through words, so language shows the limits and shape of our knowledge [Herder] |
17832 | Zermelo showed that the ZF axioms in 1930 were non-categorical [Zermelo, by Hallett,M] |
13028 | Replacement was added when some advanced theorems seemed to need it [Zermelo, by Maddy] |
17626 | The antinomy of endless advance and of completion is resolved in well-ordered transfinite numbers [Zermelo] |
10245 | One geometry cannot be more true than another [Poincaré] |